我正在开发我的第一个 iOS 应用程序,其中包含UISlider
。我知道当UISlider
被拖拽。但对于我的应用程序,我需要通过一次触摸获取滑块的值;即如果我触摸某处UISlider
, a UILabel
应该显示其正确的值。
这样子可以吗。任何教程或代码都会非常有帮助。
Here tapCount is int
声明的变量.h file
- (void)viewDidLoad
{
tapCount = 0; // Count tap on Slider
UITapGestureRecognizer *gr = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(sliderTapped:)];
[slider addGestureRecognizer:gr];
}
- (void)sliderTapped:(UIGestureRecognizer *)g
{
/////////////// For TapCount////////////
tapCount = tapCount + 1;
NSLog(@"Tap Count -- %d",tapCount);
/////////////// For TapCount////////////
UISlider* s = (UISlider*)g.view;
if (s.highlighted)
return; // tap on thumb, let slider deal with it
CGPoint pt = [g locationInView: s];
CGFloat percentage = pt.x / s.bounds.size.width;
CGFloat delta = percentage * (s.maximumValue - s.minimumValue);
CGFloat value = s.minimumValue + delta;
[s setValue:value animated:YES];
NSString *str=[NSString stringWithFormat:@"%.f",[self.slider value]];
self.lbl.text=str;
}
对于 Swift 用户
override func viewDidLoad()
{
super.viewDidLoad()
tapCount = 0
let gr = UITapGestureRecognizer(target: self, action: #selector(self.sliderTapped(_:)))
slider.addGestureRecognizer(gr)
}
func sliderTapped(_ g: UIGestureRecognizer) {
/////////////// For TapCount////////////
tapCount = tapCount + 1
print("Tap Count -- \(tapCount)")
/////////////// For TapCount////////////
let s: UISlider? = (g.view as? UISlider)
if (s?.isHighlighted)! {
return
}
// tap on thumb, let slider deal with it
let pt: CGPoint = g.location(in: s)
let percentage = pt.x / (s?.bounds.size.width)!
let delta = Float(percentage) * Float((s?.maximumValue)! - (s?.minimumValue)!)
let value = (s?.minimumValue)! + delta
s?.setValue(Float(value), animated: true)
let str = String(format: "%.f", slider.value)
lbl.text = str
}
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